package com.atguigu.eduservice.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.entity.listener.SubjectExcelListener;
import com.atguigu.eduservice.entity.subject.OneSubject;
import com.atguigu.eduservice.entity.subject.TwoSubject;
import com.atguigu.eduservice.mapper.EduSubjectMapper;
import com.atguigu.eduservice.service.EduSubjectService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2020-11-08
 */
@Service
public class EduSubjectServiceImpl extends ServiceImpl<EduSubjectMapper, EduSubject> implements EduSubjectService {

    /**
     * 添加课程分类
     * @param file
     */
    @Override
    public void saveSubject(MultipartFile file,EduSubjectService subjectService) {

        try {
            //文件输入流
            InputStream in = file.getInputStream();
            //调用方法进行读取
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(subjectService)).sheet().doRead();

        }catch (Exception e){
            e.printStackTrace();
        }


    }

    //课程分类列表(树形)
    @Override
    public List<OneSubject> getAllOneTwoSubject() {
        //1 查询所有一级分类 parentId=0
        QueryWrapper<EduSubject> wrapperOne=new QueryWrapper<>();
        wrapperOne.eq("parent_id", "0");
        List<EduSubject> oneSubjectList = baseMapper.selectList(wrapperOne);

        //2 查询所有二级分类
        QueryWrapper<EduSubject> wrapperTwo=new QueryWrapper<>();
        wrapperOne.ne("parent_id", "0");
        List<EduSubject> twoSubjectList = baseMapper.selectList(wrapperTwo);

        //创建list集合,用于存储最终封装数据
        List<OneSubject> finalSubjectList = new ArrayList<>();

        //3 封装一级分类
        //查询出来所有的一级list集合遍历,得到每一个分类对象,获取每个一级分类对象,
        //封装到要求的list集合里面List<OneSubject> finalSubjectList
        for (EduSubject eduSubject : oneSubjectList) {
            //把eduSubject里面值获取出来,放到OneSubject对象里面
            //多个OneSubject放到finalSubjectList里面
            OneSubject oneSubject = new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());
            BeanUtils.copyProperties(eduSubject, oneSubject);

            finalSubjectList.add(oneSubject);

            //4 封装二级分类

            //在一级分类循环遍历查询所有的二级分类
            //创建list集合封装每个以及分类的二级分类
            List<TwoSubject> twoFinalSubjectList = new ArrayList<>();
            //遍历二级分类list集合
            for (EduSubject subject : twoSubjectList) {
                //判断二级分类parentid和一级分类id是否一样
                if (subject.getParentId().equals(eduSubject.getId())){
                    //subject值复制到TwoSubject里面,放到twoFinalSubjectList里面
                    TwoSubject twoSubject = new TwoSubject();
                    BeanUtils.copyProperties(subject, twoSubject);
                    twoFinalSubjectList.add(twoSubject);
                }
            }

            //把一级下面所有二级分类放到一级分类里面
            oneSubject.setChildren(twoFinalSubjectList);
        }



        return finalSubjectList;
    }
}
